There is an ongoing US HIV epidemic, with 1.2 million persons living with HIV/AIDS.1 An estimated 14% of infected individuals are unaware of their HIV infection.2 In 2009, there were 45 000 new transmissions.3 Although new HIV infections are declining, there is an increase among young men who have sex with men.2 Preventing HIV in high-risk groups requires outreach using social and sexual network methods and new prevention interventions.2,4 Screening for HIV in health care settings, however, remains important for identifying patients who are unaware of their HIV infection.4